EP3854568B1 - Dispositif et procédé de changement monoaxial de la longueur des feuilles continues - Google Patents

Dispositif et procédé de changement monoaxial de la longueur des feuilles continues Download PDF

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Publication number
EP3854568B1
EP3854568B1 EP21000011.3A EP21000011A EP3854568B1 EP 3854568 B1 EP3854568 B1 EP 3854568B1 EP 21000011 A EP21000011 A EP 21000011A EP 3854568 B1 EP3854568 B1 EP 3854568B1
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EP
European Patent Office
Prior art keywords
film
roller
rollers
stretching
air
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EP21000011.3A
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German (de)
English (en)
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EP3854568A2 (fr
EP3854568A3 (fr
Inventor
Bernd Bayer
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Hosokawa Alpine AG
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Hosokawa Alpine AG
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Publication of EP3854568A3 publication Critical patent/EP3854568A3/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
    • B29C55/065—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed in several stretching steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation

Definitions

  • the invention relates to a device for the monoaxial length change of film webs in the machine direction according to the preamble of claim 1, a stretching system according to the preamble of claim 6, a blown film system for producing tubular films according to the preamble of claim 8 and a method for the monoaxial length change of film webs in the machine direction.
  • This comprises at least one processing gap delimited by two rollers, over which a film web is guided in the machine direction, wherein the first roller in the film transport direction has a first peripheral speed and the second roller in the film transport direction has a second peripheral speed.
  • stretching machines are used to reduce the thickness of the film after production. Stretching is used for both tubular and cast films.
  • a stretching line typically consists of heating rollers to prepare the film for stretching, followed by stretching rollers between which the film is stretched. Stretching can be followed by annealing or tempering rollers, where the film undergoes a temperature treatment to influence its properties. Finally, the film is cooled using chill rollers.
  • Stretching systems are operated offline or inline in blown film lines. Stretching of tubular film can also be performed inline in blown film lines, either directly after the take-off roll pair or after the turner bar system following the take-off roll pair.
  • neck-in During monoaxial stretching of film webs in the machine direction, also called longitudinal stretching, a transverse necking, the so-called neck-in, occurs with simultaneous thickening of the edges, the so-called edge build-up. This This effect is very unfavorable for further processing of the film.
  • Neck-in is disadvantageous because it complicates the film production process with regard to the required flatness for further processing of the film. The higher the neck-in, the more difficult it becomes to achieve the required film quality in the economical production of monoaxially stretched films. Disadvantages arise such as drooping film edges and other flatness errors when unwinding the produced rolls. This leads to poor winding quality and thus to poorer further processing suitability of the film, for example during printing, lamination, or laminating.
  • the DE 10 2009 046 585 A1 discloses a stretching system for longitudinally stretching film webs and a method therefor.
  • the stretching system essentially consists of a heating device, a stretching unit, and a cooling device.
  • a pressing device in the form of a support roller is used, which presses the film web against the stretching rollers.
  • the DE 10 2009 046 593 A1 also discloses a stretching system for longitudinally stretching film webs and a method therefor.
  • a deflection roller is inserted into the stretching gap between the two stretching rollers of the stretching unit. The film necks down less.
  • the transverse shrinkage or necking of the monoaxially stretched film is also counteracted by the temperature setting of the stretching rollers, as shown in the DE 10 2011 085 735 A1 Furthermore, the necking can be counteracted by adjusting the stretch gap. Reducing the roll gap leads to a reduction in the film's neck-in.
  • thickness control methods such as those from DE 10 2009 033 171 A1 known. This reduces the edge build-up during monoaxial stretching in the machine direction. For this purpose, during the production of tubular films, those areas that later form the edges of the flat film are provided with thin spots, so that After stretching, a final product with the most uniform thickness possible across the film web is created. This process also has a positive effect on reducing transverse shrinkage.
  • the CN 110 049 856 A describes a device according to the preamble of claim 1.
  • the invention is based on the object of creating a solution that enables the production of film webs with improved flatness in devices for monoaxial length change of film webs in the machine direction by reducing transverse necking and thus edge buildup. This increases the quality of the film rolls produced.
  • a vacuum source can be connected to the air-flow roller and the roller can be subjected to vacuum, wherein the air-flow roller is made of an open-porous material in the micrometer range.
  • the drawn-in air can flow continuously through the air-flow roller into the inside of the roller, and the film lies directly against the rollers across its entire width.
  • the flatness of the film web is improved.
  • Transverse constriction caused by stretching the film web with simultaneous edge build-up is also counteracted and reduced by the film being in contact with the roller.
  • a vacuum source can be connected to the roller, which allows air to flow through from the outside to the inside. The vacuum sucks the film web onto the roller and adheres more strongly to it, reducing neck-in and edge expansion.
  • the degree of neck-in and edge build-up depends, among other things, on the adhesion of the film to the rollers that define the processing gap.
  • the film slides more in the outer areas in the transverse direction, i.e., perpendicular to the transport direction of the film web, across the roller surface, thus attempting to compensate for the transverse forces acting on it.
  • This transverse neck-in occurs primarily in the processing gap and on the rollers themselves.
  • the goal is to adjust the vacuum on the rollers so that the increased friction improves the adhesion of the film web to the roller and prevents the relative speed in the transverse and longitudinal directions between the film and the roller. This achieves uniform contact between the film and the roller across the entire width of the roller. This creates a defined separation edge of the film web from the roller in the film transport direction at the roller outlet, as well as a defined contact edge of the film web on the roller in the film transport direction when it enters the roller.
  • the level of negative pressure also depends on the desired length change of the film web, the machine speed and the film properties.
  • the force with which the film is sucked onto the roller is determined by the level of the vacuum. This is approximately 100 to 300 mbar; in special cases, it can be selected to be higher or lower.
  • the vacuum is regulated accordingly depending on the properties of the film and the desired length change.
  • at least one of the rollers that define the processing gap of the length-changing device is designed as a roller through which air can flow from the outside to the inside.
  • the second roller after the processing gap is designed as an air-flow roller.
  • the drawn-in air flows out through the roller and the film lies on the roller across its entire width.
  • the air-flow roller is connected to a vacuum source.
  • the negative pressure applied to the air-permeable roller draws the film web onto the roller. This increases the friction between the film web and the device's roller, thus reducing transverse shrinkage after the processing nip.
  • the film is evenly drawn onto the roller across its entire width, including the film edges.
  • the first roller of the device upstream of the processing gap is designed as an air-flow roller. This increases contact between the film web and the roller, preventing the formation of air cushions between them. The film web thus lies evenly on the roller. The film web reaches the processing gap with less transverse constriction. This positively influences the flatness.
  • this roller can also be connected to a vacuum source. The higher forces enhance the effects.
  • the rollers before and after the processing gap are designed as air-permeable rollers. This improves adhesion of the film web without air pockets between the film web and the rollers, and reduces neck-in and edge buildup on the film.
  • the second roller is also connected to a vacuum source. This counteracts transverse necking. In rare cases, both rollers can be connected to a vacuum source.
  • the air-flow rollers can work together with or without lay-up rollers.
  • the lay-up rollers serve to additionally fix the film web to the air-flow rollers. They increase the contact between the film and the roller, ensuring that the film rests evenly against the roller.
  • the air-permeable roller is designed so that varying degrees of negative pressure can be applied across its axial length.
  • a combination of an air-permeable roller and a tempering roller can also be used. This not only tempers the film web to ensure the correct temperature for the length change, but also allows the air drawn between the film web and the roller to flow inward via the air-permeable roller.
  • the direct contact of the film web with the roller also improves heat transfer from the roller to the film web. If a vacuum is also applied to the rollers to draw the film web more firmly onto the roller, the friction between the film and the roller increases, further reducing neck-in.
  • Temperature control can be either heating or cooling.
  • the fluid such as gas, steam, water, or oil
  • a vacuum source is connected to the opposite side of the fluid supply and removal via a rotary union, and the air is extracted. If no vacuum is applied, the air escapes through these openings.
  • the combined tempering and air-flow roller like state-of-the-art rollers, also consists of a fluid-tempered double-shell roller, but it is additionally equipped with channels for air flow and can be connected to a vacuum source.
  • the channels can also be designed as small holes.
  • an air-permeable layer is applied, similar to a sintered structure. It is also possible to make the rollers from an open-porous material in the micrometer range.
  • the rollers are made of materials such as steel, stainless steel, or plastic.
  • the sintered layer for example, is made of stainless steel, which can also be highly polished.
  • the surface roughness or surface structure of the rollers can influence the friction or adhesion between the film web and the roller.
  • rollers of the same type without a double jacket are used.
  • the length-changing device comprises processing gaps, each defined by two rollers.
  • the first roller in the film web transport direction has a first peripheral speed
  • the second roller in the film web transport direction has a second peripheral speed, so that the film web undergoes a length change in the processing gap between them.
  • the second roller has a higher peripheral speed than the first roller of the device, a positive change in film length occurs. Depending on the ratio of the change in length, this is referred to as stretching, drawing, or annealing.
  • the transition in film length change from annealing to drawing and stretching is fluid.
  • Length change ratios of approximately 1:1 to 1:10 can be achieved.
  • shrinkage of the film web can be permitted in addition to lengthening; then the second roller has a lower peripheral speed than the first roller and a negative change in length results.
  • the shrinkage ratio is usually between 0.5:1 and 1:1.
  • Both rollers that define the treatment gap can also have the same peripheral speed.
  • a stretching system mentioned at the outset is characterized according to the invention in that a component of the stretching system is the device for changing the length of a film web described above and below.
  • the device according to the invention for changing the length of a film web is part of a stretching system.
  • stretching lines which usually consist of a heating roller, stretching roller, annealing roller and cooling roller arrangement
  • the stretching roller is replaced by an air-permeable roller after the stretching nip or treatment nip, as this is where the greatest improvement for the stretching process is achieved.
  • a blown film line mentioned at the outset is characterized according to the invention in that the device for changing the length of a film web described above and below is arranged inline in the blown film line.
  • Such stretching systems can be used inline or offline in a film production plant.
  • stretching systems with the device according to the invention to additionally design additional stretching rollers or additional rollers such as the annealing rollers and cooling rollers following the stretching rollers as well as the upstream heating rollers as air-flow rollers in order to further improve the film quality.
  • additional stretching rollers or additional rollers such as the annealing rollers and cooling rollers following the stretching rollers as well as the upstream heating rollers as air-flow rollers in order to further improve the film quality.
  • the device according to the invention for changing the length of a film web can be installed inline in a blown film line.
  • Blown film lines comprise, in the film transport direction, a plastic dosing device, an extruder, followed by the film blowing head and a cooling system as well as a calibration basket. This is followed by a flattening and a A pull-off device and a turning device are used. Finally, the tubular film is wound up in a winder.
  • the length-changing device When producing tubular films in blown film lines, the length-changing device according to the invention, with at least one processing gap defined by two rollers, at least one of which is an air-permeable roller, can be arranged directly in the film transport direction above the pair of take-off rollers of the take-off device, before or after the turning bars.
  • Several devices according to the invention, which comprise at least one processing gap defined by two rollers, can also be provided in a blown film line.
  • the haul-off can be designed as a stationary, rotating, or reversing haul-off. It can also be operated without turning bars.
  • the device according to the invention for monoaxial length change can be arranged as a component of a stretching system in a blown film line in the film transport direction above the take-off roller pair before or after the turning bars above the tubular film bubble.
  • the device can be installed in a stretching line either inline on the floor next to the blown film line or offline on the floor next to the blown film line.
  • the blown film line can also be designed with or without a reversing haul-off.
  • the device for monoaxial length change according to the invention can also be installed inline as part of a stretching system of a so-called MDO system, or in duplicate after a film blowing system.
  • the tubular film is then cut into two film webs at opposite points on both sides, and one film web is further processed in each stretching system.
  • the use of the device according to the invention and the use of thickness control systems can be combined.
  • thickness control systems are used in combination in the production of tubular films, for example, after DE 10 2009 033 171 A1 and
  • the use of air-flown rollers in the length-changing device has a further positive effect: with less neck-in of the film web due to stretching, less energy needs to be introduced into the control system to optimise the flatness, finely dosed control is possible and the process is thus simplified.
  • the length-changing device can also be used in a stretching or annealing system for the treatment of cast films.
  • the film web is guided over at least one processing gap delimited by two rollers.
  • the first roller in the film transport direction has a first peripheral speed and the second roller in the film transport direction has a second peripheral speed.
  • At least one of these rollers is an air-flow roller, which ensures that the film web guided over it rests against it in order to counteract transverse constriction and edge build-up of the film web and to prevent the formation of air cushions between the rollers and the film web.
  • a vacuum source can be connected to the air-flow roller, and the roller can be subjected to vacuum.
  • the air-flow roller is made of an open-porous material in the micrometer range.
  • a combination of an air-flow and a temperature-controlled roller also increases the heat transfer between the film and the roller, as the insulating air layer between them can escape through the air-flow roller. This results in a stable stretching process and, as a result, a more homogeneous film without flatness defects, as the film lies more evenly on the roller across its entire width.
  • the effect is enhanced by applying negative pressure. This allows the film's detachment edge from the roller in the film transport direction at the roller outlet to be better secured by suction, as well as the film's contact edge to the roller in the film transport direction at the roller inlet, resulting in a smaller relative speed difference in the transverse and longitudinal directions across the width of the film and the roller.
  • the process is combined with a film thickness control as used in the DE 10 2009 033 171 A1 described.
  • a tubular film is subjected to film thickness control during its production in a blown film line.
  • the thickness profile of the tubular film is regulated in such a way that the tubular film has thin spots at those points which, in a downstream inline stretching line, represent the edge areas of the flattened tubular film. This means that after stretching the film in a stretching line, a film is produced with the smallest possible deviations from the average film thickness across the film width.
  • the flattened tubular film can be a blocked film, a one-sided or two-sided, a double-flattened tubular film, or a single-layer film processed in two stretching lines.
  • the Figure 1 shows the device according to the invention for the monoaxial length change of a film web in the machine direction in a stretching system, also called MDO system, as one possible application of the device according to the invention.
  • the film web (1) is fed into the stretching system from above. First, it is guided over a heating section (II) with heating rollers (3). The film web (1) is then fed to the inventive device for changing the length (IV), in this case the stretching device, with the rollers (5a, 5b), here the stretching rollers and an intermediate processing gap, here the stretching gap, and stretched.
  • the stretching rollers (5a, 5b) can have a smaller diameter than the heating rollers.
  • the film web (1) is then fed to an annealing section (VII) with annealing rollers (6) for temperature control, followed by a cooling section (IX) with cooling rollers (9). Finally, the film (1) leaves the MDO system and can be wound up in the winder. The film web is held on the various rollers by lay-on rollers (4).
  • the Figure 2 shows the length-changing device (IV) of the stretching system in detail.
  • the film web (1) is guided over a first stretching roller (5a) to the second stretching roller (5b).
  • the stretching gap is located between the stretching rollers (5a) and (5b).
  • the second stretching roller (5b) has a higher peripheral speed than the first stretching roller (5a), resulting in a positive length change of the film web.
  • the lay-on rollers (4) serve to additionally fix the film web (1) on the stretching rollers (5a) and (5b).
  • the stretching roller (5b) is designed as an air-flow roller with the option of connecting to a vacuum source (not shown here).
  • the stretching roller (5a) and the stretching roller (5b) can also be designed as tempering rollers.
  • the stretching roller (5b) is a combination of an air-flow roller and a tempering roller.
  • lay-up rollers (4) can be omitted.
  • Stretching systems can also have more than two stretching rollers (5) and thus have several devices (IV).
  • the stretching system can have 2, 3 or more heating, stretching, annealing or cooling rollers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Advancing Webs (AREA)

Claims (13)

  1. Dispositif (IV) de changement de longueur monoaxial de feuilles continues (1) dans la direction de machine, comprenant :
    au moins une fente d'usinage délimitée par deux rouleaux (5a, 5b) à travers laquelle une feuille continue (1) est guidée dans la direction de machine,
    dans lequel le premier rouleau (5a) dans la direction de transport de feuilles présente une première vitesse circonférentielle et le second rouleau (5b) dans la direction de transport de feuilles présente une seconde vitesse circonférentielle, dans lequel
    au moins l'un des rouleaux (5a, 5b) est un rouleau (5a, 5b) pouvant être traversé par l'air de l'extérieur vers l'intérieur,
    caractérisé en ce que
    une source de dépression peut être raccordée au rouleau (5a, 5b) pouvant être traversé par l'air et le rouleau (5a, 5b) peut être soumis à une dépression,
    dans lequel le rouleau (5a, 5b) pouvant être traversé par l'air est réalisé dans un matériau à porosité ouverte de l'ordre du micromètre.
  2. Dispositif (IV) selon la revendication 1, caractérisé en ce que
    le rouleau (5a, 5b) pouvant être traversé par l'air peut être soumis sur sa longueur à une dépression d'une force variable.
  3. Dispositif (IV) selon la revendication 1 ou 2, caractérisé en ce que
    au moins l'un des rouleaux (5a, 5b) pouvant être traversés par l'air peut être combiné avec une thermorégulation.
  4. Dispositif (IV) selon la revendication 1, 2 ou 3, caractérisé en ce que
    le premier rouleau (5a) dans la direction de transport de feuilles présente une vitesse circonférentielle inférieure à celle du second rouleau (5b) dans la direction de transport de feuilles et le changement de longueur de la feuille continue (1) est un changement de longueur positif.
  5. Dispositif (IV) selon la revendication 1, 2 ou 3, caractérisé en ce que
    le premier rouleau (5a) dans la direction de transport de feuilles présente une vitesse circonférentielle supérieure à celle du second rouleau (5b) dans la direction de transport de feuilles de la feuille continue (1) et le changement de longueur de la feuille continue est un changement de longueur négatif.
  6. Installation d'étirage, caractérisée en ce que
    une composante de l'installation d'étirage est le dispositif (IV) selon l'une des revendications 1 à 5.
  7. Installation d'étirage selon la revendication 6, caractérisée en ce que
    d'autres rouleaux de l'installation d'étirage sont réalisés en tant que rouleaux pouvant être traversés par l'air avec ou sans source de dépression appliquée.
  8. Installation de soufflage de feuilles destinée à la fabrication de feuilles tubulaires, caractérisée en ce que
    le dispositif (IV) selon l'une des revendications 1 à 5 est agencé en ligne dans l'installation de soufflage de feuilles.
  9. Installation de soufflage de feuilles selon la revendication 8, caractérisée en ce que
    le dispositif (IV) selon l'une des revendications 1 à 5 est agencé dans la direction de transport de feuilles après la paire de rouleaux de traction et avant ou après des tiges de retournement de l'installation de soufflage de feuilles.
  10. Installation de soufflage de feuilles selon la revendication 8 ou 9, caractérisée en ce que
    l'installation de soufflage de feuilles présente plusieurs dispositifs (IV) selon l'une des revendications 1 à 5.
  11. Installation de soufflage de feuilles selon l'une des revendications 8 à 10, caractérisée en ce que
    le dispositif (IV) selon l'une des revendications 1 à 5 est agencé dans une position d'installation d'étirage agencée en ligne dans l'installation de soufflage de feuilles, en particulier selon l'une des revendications 6 ou 7 dans l'installation de soufflage de feuilles.
  12. Procédé de changement de longueur monoaxial de feuilles continues (1) dans la direction de machine, dans lequel :
    une feuille continue (1) est guidée à travers au moins une fente d'usinage délimitée par deux rouleaux (5a, 5b),
    dans lequel le premier rouleau (5a) dans la direction de transport de feuilles présente une première vitesse circonférentielle et le second rouleau (5b) dans la direction de transport de feuilles présente une seconde vitesse circonférentielle,
    dans lequel la feuille continue (1) subit un changement de longueur dans la fente d'usinage et au moins l'un des rouleaux (5a, 5b) est exécuté en tant que rouleau (5a, 5b) traversé par l'air de l'extérieur vers l'intérieur, dans lequel l'air, qui s'accumule entre les rouleaux (5a, 5b) et la feuille continue (1), s'évacue à travers les rouleaux (5a, 5b) et la feuille continue (1) s'applique contre le rouleau (5a, 5b),
    caractérisé en ce que
    une source de dépression est raccordée au rouleau (5a, 5b) pouvant être traversé par l'air et le rouleau (5a, 5b) est soumis à une dépression,
    et dans lequel le rouleau (5a, 5b) pouvant être traversé par l'air est réalisé dans un matériau à porosité ouverte de l'ordre du micromètre.
  13. Procédé selon la revendication 12, caractérisé en ce que
    pendant sa fabrication dans une installation de soufflage de feuilles, la feuille est soumise à une régulation d'épaisseur de feuille, de sorte que le profil d'épaisseur de feuille de la feuille tubulaire fabriquée dans l'installation de soufflage de feuilles soit régulée de sorte que le profil de consigne d'épaisseur prédéfini présente des écarts par rapport à une épaisseur de feuille uniforme, lesquels servent à la compensation du changement d'épaisseur de feuille sur la largeur de feuille, qui naît lors de l'allongement monoaxial ultérieur dans la direction de machine, de sorte que par l'étirage une feuille continue (1) soit fabriquée avec un profil transversal d'épaisseur avec des écarts aussi restreints que possible par rapport à l'épaisseur de feuille moyenne sur l'ensemble de l'épaisseur de feuille.
EP21000011.3A 2020-01-21 2021-01-18 Dispositif et procédé de changement monoaxial de la longueur des feuilles continues Active EP3854568B1 (fr)

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DE102020000334A1 (de) 2020-01-21 2021-07-22 Hosokawa Alpine Aktiengesellschaft Vorrichtung und Verfahren zur monaxialen Längenänderung von Folienbahnen
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DE202022002610U1 (de) 2022-10-17 2023-02-07 Hosokawa Alpine Aktiengesellschaft Vorrichtung zum Recken von Folienbahnen in Maschinenrichtung mit Schnellwechselvorrichtung für Walzen
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DE102016015051B4 (de) 2016-12-16 2019-01-31 Hosokawa Alpine Aktiengesellschaft Sichtrad für einen Zentrifugalkraft-Windsichter
JP6916085B2 (ja) 2017-10-24 2021-08-11 株式会社アイシン 車両用ヘッドレスト制御装置
DE102018008127B4 (de) 2018-10-13 2022-06-09 Hosokawa Alpine Aktiengesellschaft Blaskopf und Verfahren zur Herstellung einer Mehrschichtschlauchfolie
DE102018009632B4 (de) 2018-12-11 2021-12-09 Hosokawa Alpine Aktiengesellschaft Vorrichtung zum Aufwickeln und Wickelwechsel von bahnförmigem Material und ein Verfahren dafür
DE102019107335B4 (de) 2019-01-11 2024-11-07 Reifenhäuser GmbH & Co. KG Maschinenfabrik Vorrichtung und verfahren zur herstellung einer folienbahn
DE102019215492B4 (de) 2019-10-09 2025-08-07 Windmöller & Hölscher Kg Blasfolienanlage und Verfahren zur Herstellung von Folienschläuchen oder Folienbahnen
DE102019215875A1 (de) 2019-10-11 2021-04-15 Windmöller & Hölscher Kg Verfahren zum Starten oder Beenden einer Folienproduktion in einer Folienmaschine, Folienmaschine und Computerprogrammprodukt
DE102020000334A1 (de) 2020-01-21 2021-07-22 Hosokawa Alpine Aktiengesellschaft Vorrichtung und Verfahren zur monaxialen Längenänderung von Folienbahnen
RU2737006C1 (ru) 2020-06-09 2020-11-24 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") Устройство для генерации электромагнитных возмущений в низкотемпературной магнитоактивной плазме
DE102020006008B3 (de) 2020-10-01 2022-03-31 Hosokawa Alpine Aktiengesellschaft Fließbettgegenstrahlmühle zur Erzeugung feinster Partikel aus Aufgabegut geringer Schüttdichte und Verfahren dafür
CN116711318A (zh) 2021-04-19 2023-09-05 深圳市大疆创新科技有限公司 拍摄设备及其控制方法、存储介质
DE102022000351A1 (de) 2022-01-29 2023-08-03 Hosokawa Alpine Aktiengesellschaft Verfahren und Vorrichtung zur Foliendickenregelung von gereckter im Folienblasverfahren hergestellter Schlauchfolie

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US12330364B2 (en) 2025-06-17
CN113211772B (zh) 2024-12-13
MX2021000885A (es) 2021-07-22
ES3027785T3 (en) 2025-06-17
EP3854568A2 (fr) 2021-07-28
JP2021115863A (ja) 2021-08-10
CN113211772A (zh) 2021-08-06
JP7216124B2 (ja) 2023-01-31
EP3854568A3 (fr) 2021-11-03
US20210221043A1 (en) 2021-07-22
PL3854568T3 (pl) 2025-06-09
CA3106631A1 (fr) 2021-07-21
DE102020000334A1 (de) 2021-07-22

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